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Home/Sensors/Plant construction / industrial processes/SCHMIDT® Flow Sensor SS 20.225

SCHMIDT® Flow Sensor SS 20.225

A small all-rounder – universal and powerful

 

  • Dumb-bell head (largely independent from flow direction, easy to clean)
  • Flow velocity and temperature signal
  • Probe length 100 … 500 mm
  • Measuring ranges 0 … 1 / 2.5 / 10 / 20 m/s
  • Optional coated (PU, black)

 

In many applications, the direct measurement of flow velocity and volume flow in air and gases is the ideal solution. Due to the high demands of modern control technology, the flow sensor has to measure precisely and fast an extremely wide measuring range from "almost zero" up to the maximum value.

 

  • Energy-efficient control of ventilators
  • Monitoring filter units
  • Regulation and control of flow rate for extraction systems
  • Industrial processes

 

Successor product for SS 20.015 and SS 20.016 (coated version but not pressure-resistant)

 

SCHMIDT Technology – Simply a question of better measurement

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Specifications

Technical data
Measuring quantityStandard flow velocity wN, based on standard conditions 1)
Temperature of medium TM
Measured mediumAir or nitrogen, other gases upon request
Measuring range flow wN0 … 1 / 2.5 / 10 / 20 m/s
Lower detection limit flow wN0.06 m/s
Measuring range temperature TM-20 … +70 °C
Measuring accuracy
Standard wN±(5 % of measured value + [0.4 % of fmr; min 0.02 m/s]) 2)
High precision (optional) wN±(3 % of measured value + [0.4 % of fmr; min 0.02 m/s]) 2)
Response time (t90) wN3 s (jump from 0 to 5 m/s in air)
Temperature gradient wN< 2 K/min (at wN = 5 m/s in air)
TM (wN > 1 m/s)±1 K (10 … 30 °C); ±2 K (remaining measuring range)
Operating temperature
Sensor and electronics-20 … +70 °C
Storage temperature-30 … +85 °C
General data
HumidityMeasuring mode: Non-condensing (< 95 % RH)
Operating pressureAtmospheric (700 … 1,300 hPa)
DisplayLED green: Operating status
LED red (flashing): sensor defective
Supply voltage24 V DC ± 10 %
Current consumptionTyp. < 60 mA (max. 100 mA)
Analog outputs for wN and TM0 … 10 V (RL ≥ 10 kΩ, short circuit protected; CL ≤ 10 nF)
Electrical connectionStandard: Non-detachable cable, 4 wires, length 2 m
Special cable length (option): 3 … 15 m (steps of 1 m)
Maximum cable length15 m
Mounting positionArbitrary
Minimum immersion depth58 mm (< 58 mm upon request)
Protection typeSensor head: IP67; enclosure: IP65
Protection class III (SELV) or PELV (EN 50178)
Probe length100/200/350/500 mm
WeightApprox. 100 g (L = 350 mm)
Material
Sensor tubeStainless steel 1.4571
Sensor headPBT (glass-fiber-reinforced), stainless steel 1.4571
Protective coating (optional)Polyurethan (PU)
Sensor cablePVC
HousingPBT (glass-fiber-reinforced)

1) Standard conditions: TN = 20 °C and pN = 1,013.25 hPa

2) Related to adjustment reference; "fmr" = final measuring range

Subject to technical changes.

Order information

 DescriptionArticle-Number
Basic sensorSCHMIDT® Flow Sensor SS 20.225; 2 x output signal 0 … 10 V; cable length 2 m567 920-TXYZPA
 Options
TypeStandard 1     
Mechanical typeSensor length 100 mm  1    
Sensor length 200 mm  2    
Sensor length 350 mm  3    
Sensor length 500 mm  4    
Measuring range, adjustment accuracy and calibrationMesuring range 0 … 1 m/s   1   
Mesuring range 0 … 2.5 m/s   2   
Mesuring range 0 … 10 m/s   3   
Mesuring range 0 … 20 m/s   4   
Standard adjustment    1  
Standard adjustment with factory calibration certificate    2  
High-precision flow adjustment, including factory calibration certificate    3  
Protection typeWithout protective coating     1 
With protactive coating (Polyurethan derivate, PU black)     2 
Connecting cableCable length 2.0 m      1
Special cable length: 3 ... 15 m; 1 m steps      2

Accessories

Connection technology

DescriptionArticle-Number
Power supply unit: output 24 V / 1A DC, supply voltage 115/230 V AC (strip terminal)535 282

Mounting and fixing technology

DescriptionArticle-Number
Mounting flange steel, galvanic zinc-plated301 048
Compression fitting stainless steel G½, atmospheric pressure532 160
Compression fitting brass G½, atmospheric pressure517 206
Welded sleeve steel G½, according to EN 10241, 5 pieces524 916
Welded sleeve stainless steel 1.4571 G½, according to EN 10241, 2 pieces524 882
Adapter M18 x 1, G½545 090
Assembly kit for pipe assembly suitable for MD 10.010/10.015, including pipe clamps and collar for adjustment for the pipe diameter531 394

Measured value display

DescriptionArticle-Number
SCHMIDT® LED display MD 10.010, in wall housing to show the volume flow velocity, 85 … 250 V AC and sensor power supply527 320
SCHMIDT® LED display MD 10.010, similar to 527320 but with 24 V DC voltage supply528 240
SCHMIDT® LED display MD 10.015, similar to 527320 but with additional sum function and second measuring input527 330
SCHMIDT® LED display MD 10.015, similar to 527330 but with 24 V DC voltage supply528 250

Miscellaneous

DescriptionArticle-Number
Attachable protective clip for dumbbell head against mechanical influences, stainless steel531 026
Attachable protective 2-wires-clip for protection against mechanical influences,
stainless steel, H2O2-resistant		559 124

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